Why are the palisade cells on the top of the leaf?

What are some possible short and long term medical concerns for crew members on longer space exploration trips

Plants that have reproductive structures called cones are?

Asap brainliest will be which sentence about protists is accurate? all protists are unicellular and microscopic in nature. they have organelles, so protists are eukaryotic in nature. all protists make their own energy through photosynthesis.